<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>dom查询</title>
<link rel="stylesheet" type="text/css" href="style/css.css" />
<script type="text/javascript">
	window.onload = function(){
		//1.查找#bj节点
		var btn01ELe=document.getElementById("btn01");
		btn01ELe.onclick=function () {
		   var bjObj= document.getElementById("bj");
		    alert(bjObj.innerHTML);//获得起始标签和结束标签里面的内容
		}
		//2.查找所有li节点
		var btn02Ele = document.getElementById("btn02");
		btn02Ele.onclick = function(){
			var liObj=document.getElementsByTagName("li");
			alert(liObj.length);
			// for(var i=0;i<liObj.length;i++){
			//     alert(liObj[i].innerHTML);
			// }
		};
		//3.查找name=gender的所有节点
		var btn03Ele = document.getElementById("btn03");
		btn03Ele.onclick = function(){
			var genders=document.getElementsByName("gender");
			alert(genders.length);
		};
		//4.查找#city下所有li节点
		var btn04Ele = document.getElementById("btn04");
		btn04Ele.onclick = function(){
		    //1.获取id为city的节点
            //2.通过city节点按标签名查子节点
			var lis=document.getElementById("city").getElementsByTagName("li");
			alert(lis.length);
            var cities=document.getElementById("city");
		};
		//5.返回#city的所有子节点
		var btn05Ele = document.getElementById("btn05");
		btn05Ele.onclick = function(){
			var cities=document.getElementById("city");
            alert(cities.childNodes.length);
		};
		//6.返回#phone的第一个子节点
		var btn06Ele = document.getElementById("btn06");
		btn06Ele.onclick = function(){
		    //1.查询id为bj的节点
			alert(document.getElementById("phone").firstChild.innerHTML);
		};
		//7.返回#bj的父节点
		var btn07Ele = document.getElementById("btn07");
		btn07Ele.onclick = function(){
			alert(document.getElementById("bj").parentNode.innerHTML);
		};
		//8.返回#android的前一个兄弟节点
		var btn08Ele = document.getElementById("btn08");
		btn08Ele.onclick = function(){
			//1.获取id为android的节点
            //2.通过android节点获取前面兄弟节点
            alert(document.getElementById("android").previousSibling.innerHTML);
		};
		//9.读取#username的value属性值
		var btn09Ele = document.getElementById("btn09");
		btn09Ele.onclick = function(){
			alert(document.getElementById("username").value);
		};
		//10.设置#username的value属性值
		var btn10Ele = document.getElementById("btn10");
		btn10Ele.onclick = function(){
            document.getElementById("username").value="国哥真帅";
		};
		//11.返回#bj的文本值
		var btn11Ele = document.getElementById("btn11");
		btn11Ele.onclick = function(){
			// alert(document.getElementById("bj").innerHTML);
            // alert(document.getElementById("bj").innerText);
            alert(document.getElementById("city").innerHTML);
            // alert(document.getElementById("city").innerText);
		};
	};
</script>
</head>
<body>
<div id="total">
	<div class="inner">
		<p>
			你喜欢哪个城市?
		</p>

		<ul id="city">
			<li id="bj">北京</li>
			<li>上海</li>
			<li>东京</li>
			<li>首尔</li>
		</ul>

		<br>
		<br>

		<p>
			你喜欢哪款单机游戏?
		</p>

		<ul id="game">
			<li id="rl">红警</li>
			<li>实况</li>
			<li>极品飞车</li>
			<li>魔兽</li>
		</ul>

		<br />
		<br />

		<p>
			你手机的操作系统是?
		</p>

		<ul id="phone"><li>IOS</li><li id="android">Android</li><li>Windows Phone</li></ul>
	</div>

	<div class="inner">
		gender:
		<input type="radio" name="gender" value="male"/>
		Male
		<input type="radio" name="gender" value="female"/>
		Female
		<br>
		<br>
		name:
		<input type="text" name="name" id="username" value="abcde"/>
	</div>
</div>
<div id="btnList">
	<div><button id="btn01" onclick="btn01Ele">查找#bj节点</button></div>
	<div><button id="btn02">查找所有li节点</button></div>
	<div><button id="btn03">查找name=gender的所有节点</button></div>
	<div><button id="btn04">查找#city下所有li节点</button></div>
	<div><button id="btn05">返回#city的所有子节点</button></div>
	<div><button id="btn06">返回#phone的第一个子节点</button></div>
	<div><button id="btn07">返回#bj的父节点</button></div>
	<div><button id="btn08">返回#android的前一个兄弟节点</button></div>
	<div><button id="btn09">返回#username的value属性值</button></div>
	<div><button id="btn10">设置#username的value属性值</button></div>
	<div><button id="btn11">返回#bj的文本值</button></div>
</div>
</body>
</html>